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通过热模拟机 Gleeble- 15 0 0对控制冷却过程的模拟 ,研究了相变区冷速对 6 0 Si2 Mn A弹簧钢的组织结构、珠光体量、珠光体片层间距和平均晶粒尺寸的影响 ,结果表明 ,冷速 v≤ 5℃ / s时 ,组织为珠光体 +铁素体 ;v>5℃ / s时 ,有马氏体产生 ;v=3℃ / s时珠光体量达到 85 % ;珠光体片层间距在 v=9～ 11℃ / s时达到较小值 0 .118～ 0 .133μm;在 v=7℃ / s时 ,平均晶粒尺寸达到较小值 2 6 .1μm。综合考虑 ,终轧温度 95 0℃ ,吐丝温度在 870～ 930℃范围内 ,相转变时冷却速度控制在 5℃ / s,产品性能得到明显改善
Through the simulation of controlled cooling process by the thermal simulator Gleeble-15 0 0, the effects of cooling rate in phase transformation zone on microstructure, pearlite volume, pearlite lamella spacing and average grain size of 60 Si2 Mn A spring steel The results showed that the microstructure was pearlite + ferrite at v ≤ 5 ℃ / s and martensite at v> 5 ℃ / s. The amount of pearlite reached 85 at v = 3 ℃ / s %; Pearlite sheet spacing at the v = 9 ~ 11 ℃ / s to a small value of 0.118 ~ 0.133μm; at v = 7 ℃ / s, the average grain size to a smaller value of 26.1μm . Taken together, finishing temperature of 95 0 ℃, spinning temperature in the range of 870 ~ 930 ℃, phase transition cooling rate control at 5 ℃ / s, the product performance has been significantly improved